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Treatment of leather industry wastewater by aerobic biological and Fenton oxidation process.
机构信息
Department of Chemical Engineering, NIT, Durgapur, Mahatma Gandhi Avenue, Durgapur, West Bengal, India.
出版信息
J Hazard Mater. 2010 Aug 15;180(1-3):204-11. doi: 10.1016/j.jhazmat.2010.04.014. Epub 2010 Apr 13.
Degradation of leather industry wastewater by sole aerobic treatment incorporating Thiobacillus ferrooxidans, Fenton's reagents, and combined treatment was investigated in this study. The sole treatment by Fenton's oxidation involving the introduction of 6g FeSO(4) and 266 g H(2)O(2) in a liter of wastewater at pH of 3.5 and 30 degrees C for 30 min at batch conditions reduced COD, BOD(5), sulfide, total chromium and color up to 69%, 72%, 88%, 5%, 100% and T. ferrooxidans alone showed maximum reduction to an extent of 77, 80, 85, 52, 89, respectively, in 21 d treatment at pH 2.5, FeSO(4) 16 g/L and temperature of 30 degrees C. The combined treatment at batch conditions involving 30 min chemical treatment by Fenton's oxidation followed by 72 h biochemical treatment by T. ferrooxidans at batch conditions gave rise up to 93%, 98%, 72%, 62% and 100% removal efficiencies of COD, BOD, sulfide, chromium and color at pH of 2.5 and 30 degrees C. Decrease in photo absorption of the Fenton's reagent treated samples, as compared to the banks, at 280, 350 and 470 nm wave lengths was observed. This may be the key factor for stimulating the biodegradation by T. ferrooxidans.
本研究考察了单一好氧处理、结合氧化亚铁硫杆菌（Thiobacillus ferrooxidans）、芬顿试剂和组合处理对制革工业废水的降解作用。在批处理条件下，将 6g FeSO4 和 266g H2O2 引入 1L 废水，在 pH 值为 3.5 和 30°C 的条件下反应 30min 的单一芬顿氧化处理可将 COD、BOD5、硫化物、总铬和色度分别降低 69%、72%、88%、5%和 100%，而氧化亚铁硫杆菌单独处理 21d 时，在 pH 值为 2.5、FeSO4 浓度为 16g/L 和温度为 30°C 的条件下，可将 COD、BOD5、硫化物、总铬和色度分别最大程度地降低至 77%、80%、85%、52%和 89%。在批处理条件下，先进行 30min 的芬顿化学处理，然后再进行 72h 的氧化亚铁硫杆菌生化处理的组合处理，在 pH 值为 2.5 和 30°C 的条件下，可使 COD、BOD、硫化物、铬和色度的去除率分别达到 93%、98%、72%、62%和 100%。与空白对照组相比，芬顿试剂处理后的样品在 280、350 和 470nm 波长处的光吸收值降低，这可能是刺激氧化亚铁硫杆菌生物降解的关键因素。
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